Digital learning object for audiovisual production

Funding Information: ACKNOWLEDGMENT A.V. M. Author thanks to the professors and technicians of Federal University of Paraíba (UFPB) who assisted with permissions, classrooms, studios, laboratories, and equipment for the research. Thanks also for the support of the Faculty of Science and Technology (FCT) of the New University of Lisbon (NOVA).This article deals with a case study in which a digital learning object (DLO) was developed to assist in the pedagogical practice in higher education (audiovisual area). The main results obtained were the excellent conceptual evaluation received by the DLO tool; as well as great concepts received in evaluations that refer to relevance, differentiation, credibility, and intention to use (among other metrics). In addition, a blind analysis also showed that there was no qualitative difference between the practical work developed with or without the aid of the tool (due to a potential gain of time that could be perceived and enjoyed for the execution of the activities performed, due to an automation process offered by the tool). The final conclusions pointed to a positive indication of the use of DLOs in teaching practice in higher education, as the digital tool was very well received by students during classes and helped to review and reinforce the learning content taught. Thus, the study reinforces the research developed in the area of education on the effectiveness of the use of technologies in supporting pedagogical activities, besides adding another experiment related to mixed digital learning. However, it stresses that collaborative research can lead to a further analysis of the pedagogical contributions of DLOs.publishersversionpublishe

Expectativa dos alunos sobre a aula ecológica na Embrapa Florestas.

Resumo

A utilização de materiais naturais como ferramentas pedagógicas nas atividades de Educação Ambiental.

Organizado por Patricia Póvoa de Mattos, Celso Garcia Auer, Rejane Stumpf Sberze, Katia Regina Pichelli e Paulo César Botosso

Calculation of the Infrared Intensity of Crystalline Systems. A Comparison of Three Strategies Based on Berry Phase, Wannier Function, and Coupled-Perturbed Kohn–Sham Methods

Three alternative strategies for the calculation of the IR intensity of crystalline systems, as determined by Born charges, have been implemented in the Crystal code, using a Gaussian type basis set. One uses the Berry phase (BP) algorithm to compute the dipole moment; another does so, instead, through well localized crystalline orbitals (Wannier functions, WF); and the third is based on a coupled perturbed Hartree–Fock or Kohn–Sham procedure (CP). In WF and BP, the derivative of the dipole moment with respect to the atomic coordinates is evaluated numerically, whereas in CP it is analytical. In the three cases, very different numerical schemes are utilized, so that the equivalence of the obtained IR intensities is not ensured a priori but instead is the result of the high numerical accuracy of the many computational steps involved. The main aspects of the three schemes are briefly recalled, and the dependence of the results on the computational parameters (number of k points in reciprocal space, tolerances for the truncation of the Coulomb and exchange series, and so on) is documented. It is shown that in standard computational conditions the three schemes produce IR intensities that differ by less than 1%; this difference can be reduced by an order of magnitude by acting on the parameters that control the accuracy of the calculation. A large unit cell system (80 atoms per cell) is used to document the relative cost of the three schemes. Within the current implementation the BP strategy, despite its seminumerical nature, is the most efficient choice. That is because it is the oldest implementation, and it is based on the simplest of the three algorithms. Thus, parallelism and other schemes for improving efficiency have, so far, been implemented to a lesser degree in the other two cases

Performance of six functionals (LDA, PBE, PBESOL, B3LYP, PBE0 and WC1LYP) in the simulation of vibrational and dielectric properties of crystalline compounds. The case of forsterite Mg2SiO4

The performance of six different density functionals (LDA, PBE, PBESOL, B3LYP, PBE0, and WC1LYP) in describing the infrared spectrum of forsterite, a crystalline periodic system with orthorhombic unit cell (28 atoms in the primitive cell, Pbmn space group), is investigated by using the periodic ab initio CRYSTAL09 code and an all-electron Gaussian-type basis set. The transverse optical (TO) branches of the 35 IR active modes are evaluated at the equilibrium geometry together with the oscillator strengths and the high-frequency dielectric tensor 8. These quantities are essential to compute the dielectric function ϵ(ν), and then the reflectance spectrum R(v), which is compared with experiment. It turns out that hybrid functionals perform better than LDA and GGA, in general; that B3LYP overperforms WC1LYP and, in turn, PBE0; that PBESOL is better than PBE; that LDA is the worst performing functional among the six under study

Levantamento fitossociológico em Floresta Ombrófila Densa Submontana, Município de Guaraqueçaba, localidade de Serra Negra, Paraná.

1 CD-ROM. Autoria bilíngue: CONGRESSO E EXPOSICAO INTERNACIONAL SOBRE FLORESTAS, 5., 1999, Curitiba

DETERMINAÇÃO da curva de retenção de água no solo em laboratório.

Determinação da curva de retenção; Coleta da amostra; Preparo da amostra; Saturação das amostras e membranas porosas; Introdução das amostras na câmara de pressão; Determinação da densidade aparente e do peso seco da amostra; Cálculos para determinação do conteúdo de água no solo; Obtenção da curva de retenção de água no solo. Equipe Técnica: Aderson Soares de Andrade Júnior, Edson Alves Bastos, Rafael Maschio e Everaldo Moreira da Silva.bitstream/CPAMN-2009-09/21443/1/curva_retencao.pd